feat: migrate remaining logic from main.js

[schultek]

Part of #12548

Migrate the remaining logic from main.js to Dart.

[gemini-code-assist]

Summary of Changes

Hello @schultek, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request finalizes the migration of client-side JavaScript logic from main.js to Dart. It consolidates operating system detection, interactive Table of Contents features, and platform-specific key displays into the Dart codebase, thereby eliminating the dependency on the legacy JavaScript file and streamlining the client-side scripting architecture.

Highlights

• Complete JavaScript Migration: The entire main.js file, which contained various client-side functionalities, has been successfully migrated to Dart, leading to its removal from the project.
• Refactored OS Detection: The logic for detecting the user's operating system has been moved and refactored into Dart, replacing the previous _ClientOperatingSystem enum and its fromUserAgent method with a new getOS() utility.
• Table of Contents (TOC) Functionality: All interactive features of the Table of Contents, including the scrollspy mechanism, dropdown menu, and active link highlighting, have been reimplemented in Dart.
• Platform-Specific Key Handling: The dynamic display of platform-specific keys (e.g., 'Command' for macOS, 'Control' for other OSes) is now managed entirely within the Dart codebase.

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[gemini-code-assist]

Code Review

This pull request migrates the remaining JavaScript logic from main.js to Dart, enhancing the application's maintainability and performance. The changes include moving the getOS function, setting up platform-specific keys, and implementing table of contents functionality in Dart. The JavaScript file main.js is removed, and the corresponding script tag is removed from dash_layout.dart. The pull request also includes updates to the tab setup logic to use the Dart implementation of getOS.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 8e888f0):

https://flutter-docs-prod--pr12587-feat-migrate-main-js-69tb2e8p.web.app

[parlough]

Wooo, goodbye & farewell JS 👋